changes to the apr atomic implementations for unix-ish boxes

a) need to check for __ppc__ on Darwin to pick up the PPC
   non-portable atomics

b) axe the historic checks for defined(apr_atomic_foo) when deciding
   whether to generate the default version of apr_atomic_foo; checking
   for APR_OVERRIDE_ATOMIC_FOO is sufficient

c) if the platform has defined apr_atomic_cas32() but not all the
   other apr_atomic_foo32(), use apr_atomic_cas32() in a generic
   version that will be much preferable to the no-cas32 version
   (which must use locking)


git-svn-id: http://svn.apache.org/repos/asf/apr/apr/trunk@64818 13f79535-47bb-0310-9956-ffa450edef68

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